Calender stack



y 18, 1965 1.. A. MOORE ETAL 3,183,826

CALENDER STACK Filed y 1 63 2 Sheets-Sheet 2 5 27 1' MN I H 2/ INVENTORS Zawezza lgzwi wfioore Z91 0 F i ibcrzzif w; $0M; 40M TTORNEYS United States Patent 3,183,826 CALENDER STACK Lawrence A. Moore and Le Roy F. Gilbank, Beloit, Wis.,

assignors to Beloit Corporation, Beioit, Wis., 11 corporation of Wisconsin Filed .luiy 11, 1963, Ser. No. 294,368 12 Claims. (Cl. 100-163) This invention relates to improvements in paper machines and more particularly relates to an improved form of calender stack for use in such machines.

A principal object of the present invention is to provide an improved form of calender stack arranged with a view toward utmost simplicity and economy in construction.

A further object of the invention is to improve upon the calender stacks heretofore in use, by so arranging the calender roll supporting posts to contain the lubricating lines and air lines necessary to lubricate and regulate the nip pressures between the calender rolls, in which the posts open toward the inside of the stack, to provide accessibility to the lubricating and air lines.

Another object of the invention is to provide a calender stack in which the supporting post construction of the calender frame has been materially simplified over former calender stacks and the posts form a mounting means on their facing insides for the lift arms for the calender rolls, as well as a mounting means for the means for relieving the calender rolls from the weight of the supporting bearings therefor, and the means for lifting the calender rolls out of engagement with each other.

Still another object of the invention is to provide an improved form of calender stack having parallel spaced channel-like posts opening toward each other and forming guide means on their insides at the front end of one leg of the channel for vertical movable lift bars, lifting the bearing supports with respect to each other, and having mounting means extending along the other legs of the posts forming mountings for the mounting brackets for the lift arms of the calender,

A further object of the invention is to provide an improved form of mounting means for the calender rolls of a calender stack together with a load relieving means for the lift arms for the calender rolls, so arranged as to avoid interference with lifting of the calender rolls out of en gagement with each other.

A still further object of the invention is to improve upon the calender stacks heretofore in use, by mounting the calender rolls on lift arms pivoted to the supporting posts of the calender frame intermediate the ends of the lift arms by utilizing an improved form of lifting means for lifting the lift arms, which is normally out of contact with the lift arms, and is in the form of positively driven lift bars having lift pins extending over the rear end portions of the lift arms, successively engaging the lift arms to first lift the top roll and then successively lift the lower rolls, together with a simplified form of load relieving means independent of the lift arms, and so arranged as to accommodate free lifting to the lift arms and calender rolls, and to avoid the interference between the load relieving means and the lifting means.

These and other objects of the invention will appear from time to time as the following specification proceeds and with reference to the accompanying drawings wherein:

FIGURE 1 is a view in side elevation of a calender stack constructed in accordance with the principles of the present invention;

FIGURE 2 is a transverse sectional view taken substantially along line II-11 of FIGURE 1 and illustrating certain details of mechanism for lifting the calender rolls out of engagement with each other at the termination of a calendering operation;

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FIGURE 3 is a fragmentary sectional view taken substantially along line IIIIII of FIGURE 1 and showing certain details of the mounting means for the calender rolls, as well as the lifting means for the rolls; and

FIGURE 4 is a sectional view taken substantially along line IVIV of FIGURE 1.

In the embodiment of the invention illustrated in the drawings, -1 have shown in FIGURES 1 and 2, a calender stack 10, comprising a pair of spaced upright posts 11, suitably connected in parallel spaced relation with respect to each other.

The posts '11 each have a base 12 extending forwardly therefrom and having bearing supports 13 extending upwardly therefrom forming bearing supports for a bottom or king roll 15. Extending above the bottom roll 15 and supported on said roll is a series of superposed calender rolls 16, 16 providing a series of pressure nips between said calender rolls (with each roll 16 defining a calender nip with the roll immediately below it).

The bottom roll 15 serves as a finishing roll and is the driven roll of the calender stack. The roll 15 may be driven from a suitable source of power in a conventional manner (not shown) and may have a plated surface, plated with chrome or nickel to provide a highly polished surface where the stack is used for glossing treatment. The superposed rolls 16, 16 are driven by contact with a web trained through the nips thereof and the nip between the lower roll 16 and the bottom roll 15, although they may be positively driven if desired.

The rolls 16, 16 are of a similar construction and are each mounted at their opposite ends on the posts 11, 11 in a similar manner, so the mounting of one roll only need herein be shown and described in detail.

It will be noted that each roll 16 has a substantial lengthto-diameter ratio (such that it responds to load unbalance thereon, e.g., via the full weight of the bearings, by a certain amount of deflection, in the manner recognized by the skilled workers in this art).

Each roll 16 is journal'led at its opposite ends in antifriction bearings (not shown) mounted in bearing housings 17, 17 mounted on the outer ends of lift arms 19, 19 in a conventional manner. The lift arms 19, 19 extend rearwardly of the bearing housing 17, 17 along the inner sides of the posts 11, 11 and are transversely pivoted thereto on hearing supports 20, 215 in a manner which will hereinafter more clearly appear as this specification proceeds.

The posts 11, 11 are mounted at their lower ends on a suitable base (not shown) and are connected together at their upper ends by a cross beam 21. Each post is generally channel-like in cross section and has a web 22 extending along the outer side thereof and parallel spaced legs 23 extending inwardly from said web toward the center of the calender stack. The legs 23, 23 have front and rear flanges 24 and 25 respectively extending therefrom towards the center of the associated post but stopping short of a center of said post to provide an access opening extending along each post, to afford access to air lines and oil lines extending vertically along said posts.

Such lines are designated by the reference letters X in the sectional view of FIGURE 3.

The front flange 24 has a flat face facing the center of the calender stack having a recess 26 therein, and extending for substantially the length thereof. The recess 26 has a T-slot 27 extending inwardly therefrom and (FIGURE 2) extending for the length of the flange 24 and opening to the top of the post 11.

The recess 26 receives and forms a guide for rectangular bases 29 of the bearing supports 20 pivotally supportingv the lift arms 19. As shown in FIGURES 3 and 4, the bearing support 20 is in the form of a hollow boss extending from the base 29 and having a bearing 30 carried thereon forming a bearing for a lift arm 19, intermediate the ends of said arm. A T-bolt 31 is mounted in the T-slot 27 and extends outwardly therefrom through the hollow boss of the bearing support 20 and forms a mounting for said hollow boss. A washer and nut 32 on the outer end of said T-bolt serves to tighten the head-of said bolt inthe T-slot 27 and to retain said bearing support 20 to the flange 24. Spacers 33 are provided to space the a the base 29 and retained to the groove 26 by said base upon the tightening of a nut and washer 32 on the T-bo'lt 31.

The rear flange 25 has an inner slot 39 extending therealong and opening to the center of the calender stack and forming a slidable guide for a lift bar 40..

The rear flange 25 also has a T-slot 41 extending therealong and forming a mounting for a T-bolt 43 extending through a boss portion 42 of a bracket 44 for a load relieving lever 45, and a fluid pressure operated diaphragm 4-6. The 'T-bolt 42 forms a pivot for the load relieving lever 45. The bracket 44 has a base 47'extending over the lift bar 49 and serving as a retainer therefor, it being understood that a bracket 44;- is provided for each calender roll 16.

The lift arms 19 extend rearwardly from the bearing supports 20 along the lift bars 4t? and under lift pins 49, mounted in and extending from said lift bars toward the center of the machine. The lift pins 4'? are spaced from bearing surfaces 50 on the rear end portions of the lift arms 19, to avoid interference with said lift arms during operation of the calender, and to be free from the pressure relieving levers 45 at all times. The lift pins 49 are also spaced closer together from the top to the bottom of the lift bar 40. The top pin 49 will thus engage the top bearing surface first upon downward movement of the associated lift bar and first lift the top roll of the calender stack. The lift pins 49 will then successively engage the lower bearing surfaces on the rear end portions of the lift arms 1 to successively lift the calender rolls out of engagement with each other from the top to the bottom of the stack. 7 a

Each lift bar 4i) is vertically moved along its slot 39 by a threaded shaft 51 of a screw jack 52. The shaft 51 is connected with a plate 52a slidably guided in the slot 39 and connected with a lift bar 4% at its upper end. The threaded shaft 51 extends within a housing 53 for a worm 54 and Worm gear 55. The worm gear 55 may beinternally threaded and may be threaded on said shaft and held from axial movement with respect to said shaft. The shaft 51 may also be held from axial movement so that upon rotation of the worm gear 55 the shaft will move vertically along the slot 39 to raise the calender rolls out of engagement with each other, or to free the lift pins from the liftarms 19 during the operation of calendering. The screw jack may be a commercial form of screw jack such as a Duff Norton jack in which the threaded shaft 51 is locked in position. A screw jack 52 is mounted at the bottom of each post 11. The worms 54 are mounted on shafts 56 connected together through a suitable drive coupling (not shown) to drive the worm gears 55 at the same rates of speed and to simultaneously raise and lower the lift bars 40 at the same rates of speed. The shaft 56 may be power operated and driven through a suitable motor (not shown) in a conventional manner.

The bracket :4 has a depending arm 6i) forming a mounting for the diaphragm 46 on the rear face thereof. The diaphragm 46 is connected at its oppositeface with a lever arnr-dll of the load. relieving lever 45 pivotally mounted on. the T-bolt 43. A nut 66 threaded on the outer end of the T-bolt formsa means for securing the bracket 44 to the outer face of the flames 2-5.

The load relieving lever has an arm 67 extending inwardly from the pivot pin 43 over the bearing surface and has an engaging end portion 69 engaging said bearing surface, to pivot the lever 19 in a direction to lift the bearing housings .17 upon the admission of fluid under pressure, such as air, to the diaphragms 46. This will relieve the associated calender rolls from a predetermined part of the weight of the bearing housings and bearings (thereby tending to relieve deflection in the calender rolls 16 which may be caused by the full weight of the bearing, and housings therefor, all as more fully understood by the workers in this art), and the pressure entering the diaphragm may be so governed so that the weight of the calender rolls by themselves may determine the nip pressures. The diaphragms 46 may be air operated diaphragms of a conventional form and are no part of the present invention so need not herein be shown or described further.

It should here be understood that the bellcranks or load levers 45 and brackets 44 may be reversed to en gage the load levers with the undersides of the lift arms upon the admission of fluid under pressure to said diaphragms where it may be desired to increase the nip pressures.

It is, of course, understood that the same load levers are employed for each of the lift arms and that independent control means such as a valve or series of valves for each pair of horizontally aligned diaphragms for each calender roll may be provided to supply fluid under pressure to said diaphragms under the control of the operator for the calender. The valves may be of a conventional form and are no part of the present invention, so need not herein be shown or described further.

While we have herein shown and described one form in which the invention may be embodied, it will be understood'that various modifications and variations in the invention may be effected without departing from the spirit and scope of the novel concepts of the present invention.

We claim as our invention:

1. In a calender stack, a pair of parallel spaced channel-like posts opening toward each other, a base extending from the bottoms of said posts having bearing supports extending upwardly therefrom, a bottom roll journalled in said bearing supports, a series of spaced superposed calender rolls supported on said bottom roll, the supports for said calender rolls comprising individual bearing housings for the ends of said rolls, lift arms supporting said bearing housings and extending along the in sides of said posts and pivoted thereto intermediate their ends, pivoted load relieving levers pivotally mounted on said posts engaging uppersurfaces on opposite ends of said lift arms from said bearing supports, and fluid pressure operated members holding said pivoted load relieving levers and lift arms in position and rocking said pivoted load relieving leversto engage said arms and exert lifting pressures on said bearing housings and rolls, and fluid pressure lines operatively connected to said fluid pressure operated members and extending from each of said members in readily'accessible position Within the openings of said channel-like posts. V

2. In a calender stack, a pair of parallel spaced channel-like posts opening toward each other, a base extend- 'ing from the bottoms of said posts having bearing supports extending upwardly therefrom, a bottom roll j0urnalled in said bearing supports, a series of spaced supermediate their ends, pivoted load relieving levers pivotally mounted on said posts engaging upper surfaces on the ends of said lift arms opposite from said posts, fluid pressure means holding, said loadrelieving levers in position and operating said load relieving levers to engage the upper surfaces on said lift arms and relieve said rolls from a part of the weight of said bearing housings, means guided for slidable movement alongthe insides of said posts and engaging the same ends of said arms engaged by said load relieving levers, and operable independently of said load relieving levers, to pivot said lift arms and successively lift said calender rolls out of engagement with each other from the top to the bottom of the calender stack, and fluid pressure lines operatively connected with said fluid pressure means and extending from each of said fluid pressure means in readily accessible position within the openings of said channel-like posts.

3. In a calender stack, a pair of parallel spaced channel-like posts opening toward each other, a base extending from the bottoms of said posts having bearing supports extending upwardly therefrom, a bottom roll journalled in said bearing supports, a series of spaced superposed calender rolls supported on said bottom roll, the supports for said calender rolls comprising individual bearing housing for the ends of said rolls, lift arms transversely pivoted to the insides of said posts and supporting said bearing housings and extending across said posts to positions adjacent the rear ends thereof and having upwardly facing bearing surfaces at their rear ends, and means for progressively pivoting said lift arms and lifting said rolls out of engagement with each other from the top to the bottom of the calender stack comprising a lift bar guided for movement along the inside of each post and having a series of lifting pins projecting inwardly therefrom, each lifting pin being spaced above an associated bearing surface, and said lifting pins being progressively spaced closer together from the tops to the bottoms of said lift bars to first engage the top bearing surface and then successively engage the lower bearing surfaces, and power means for moving said lift arms downwardly to successively raise said rolls from the top to the bottom thereof, and to hold said lift arms in raised positions.

4. In a calender stack, a pair of parallel spaced channel-like posts opening toward each other, a base extending forwardly of the bottoms of said posts having hearing supports extending upwardly therefrom, a bottom roll journalled in said bearing supports, a series of spaced superposed calender rolls supported on said bottom roll, the supports for said calender rolls comprising individual bearing housings for the ends of said rolls, lift arms supporting said bearing housings and extending along the inner sides of said posts and pivoted thereto intermediate their ends, said lift arms having upwardly facing bearing surfaces adjacent their rear end portions, and means free from said calender rolls during the calendering operation for raising said calender rolls out of engagement with each other comprising a lift bar guided for movement along the inside of each post and having a series of lifting pins projecting inwardly therefrom over said bearing surfaces, each lifting pin being spaced above an asso ciated lift arm, and successively lifting said calender rolls from the top to the bottom of the stack, and screw and nut means operatively connected with said lift bars for moving said lifts bars to engage said lifting pins with said bearing surfaces and holding said calender rolls apart for threading of a new web through the calender stack.

5. In a calender stack, a pair of parallel spaced channellike posts opening toward each other, a base extending forwardly of the bottoms of said posts having bearing supports extending upwardly therefrom, a bottom roll journalled in said bearing supports, a series of spaced superposed calender rolls supported on said bottom roll, the supports for said calender rolls comprising individual bearing housings for the ends of said rolls, lift arms supporting said bearing housings and extending along the inner sides of said posts and pivoted thereto intermediate their ends, said lift arms having upwardly facing bearing surfaces adjacent their rear end portions, and means free from said calender rolls during the calendering operation for raising said calender rolls out of engagement with each other comprising a lift bar guided for movement along the inside of each post and having a series of lifting pins projecting inwardly therefrom over said bearing sur faces, each lifting pin being spaced above an associated lift arm, said lifting pins being progressively spaced closer together from the top to the bottom of said lift bars and screw and nut means operatively connected with said lift bars for moving said lift bars to engage said lifting pins with said bearing surfaces and progressively lift said rollers out of engagement with each other from the top to the bottom of a calender stack and holding said calender rolls apart for threading of a new web through the ca lender stack, and means operable independently of said lift bars and pins for relieving the calender rolls from the weight of their hearing supports and thereby relieving the nip pressures comprising an individual load relieving lever in association with each lift arm, said load relieving lever-s .being transversely pivoted to said posts and extending over said bearing surfaces, and fluid pressure operated means for moving said load relieving levers in directions to engage said bearing su'faces and exert forces on said lift arms to relieve the loads between the calender roll nips.

6. A multi-nip calender comprising a vertical calender frame including a pair of laterally spaced vertically extending posts, a stack of calender rolls disposed in front of said posts and including a bottom roll and a plurality of superposed rolls supported thereon, separate and independent hearings rotatably supporting the ends of said calender rolls, lift arms having housings for said hearings on the outer ends thereof, transversely pivoted to said posts and extending along the inner sides thereof toward the rear ends of said posts and having top bearing surfaces at their rear ends, means for successively pivoting said lift arms from the top to the bottom thereof and raising said calender rolls out of engagement with each other and out of engagement with said bottom roll, comprising a separate lift bar guided for movement along the inside of each post, means for simultaneously moving said lift bars along said posts and holding said lift bars in position with respect to said posts, a plurality of parallel spaced pin extending inwardly from said lift bars over said bearing surfaces and spaced thereabove, when said cal ender rolls are in engagement with each other, and progressively spaced farther apart from the top to the bottom of said bars for engaging said bearing surfaces and pivoting said lift arms to successively raise said calender rolls out of engagement with each other.

7. A multi-nip calender comprising a vertical calender frame including a pair oflaterally spaced vertically extending posts, a stack of calender rolls disposed in front of said posts and including a bottom roll and a plurality of superposed rolls supported thereon, separate and independent bearings rotatably supporting the ends of said calender rolls, lift arms having housings for said hearings on the outer end-s thereof, transversely pivoted to said posts and extending along the inner sides thereof toward the rear ends of said posts and having top bearing surfaces at their rear ends, means for successively pivoting said lift arms from the top to the bottom thereof and raising said calender rolls out of engagement with each other and out of engagement with said bottom roll, comprising a separate lift bar guided for movement along the inside of each post, means for simultaneously moving said lift bars along said posts and holding said lift bars in position with respect to said posts, a plurality of parallel spaced pins extending inwardly from said lift bars over said bearing surfaces and spaced thereabove, when said calender rolls are in engagement with each other, and progressively spaced farther apart from the top to the bottom of said bars for engaging said bearing surfaces and pivoting said lift arms to successively raise said calender rolls out of engagement with each other, a separate resses load relieving lever in association with each lift arm and transversely pivotedto said posts adjacent the end portions thereof opposite from said pivots for said lift arms,

and having engaging end portions extending over said bearing surfaces, and fluid pressure mean mounted on said posts and having engagement with said load relieving levers and pivoting said lead relieving levers to engage said bearing surfaces and relieve said calender'rolls from a part of the weight of said bearings and bearing housings, and holding said lead relieving levers in various operative positions with respect to said lift arms.

8. A multi-nip calender comprising a vertical calender frame including a pair of laterally spaced vertically extending posts, a stack of calender rolls disposed in front of said posts and including a bottom roll and a plurality of superposed rolls supported thereon, separate and independent rbearings rotatably supporting the ends of said calender rolls, lift arms having housings for said bearings on the outer ends thereof, transversely pivoted to said posts and extending along the inner sides thereof toward the rear ends of said posts and having top bearing surfaces at their rear ends, means for successively pivoting said lift arms from the top to the bottom thereof and raising said calender rolls out of engagement with each other and out of engagement withsaid bottom roll, comprising a separate lift bar guided for movement along the inside of each post, mean-s for simultaneously moving said lift bars along said posts and holding said lift bars in position with respect to said posts, a plurality of parallel spaced pins extending inwardly from said lift bars over said bearing surfaces and spaced thereabove, when said calender rolls are in engagement with each other, and progressively spaced farther apart from the top to the bottom of said bars for engaging said bearing surfaces and pivoting saidlift arms to successively raise said calender rolls out of engagement with each other, a separate load relieving lever in association with each lift arm and transversely pivoted to said posts adjacent the end portions thereof opposite from said pivots for said lift arms, and having engaging end portions extending over said bearing surfaces, and 'fluid pressure means mounted on said posts and having engagement with said lead relieving levers and pivoting said load relieving levers to engage said bearing surfaces and relieve said calender rolls from a part of the weight of said bearings and bearing housings, and holding said load relieving levers in various operative positions with respect to said lift arms, comprising an individual fluid pressure operated diaphragm for each load relieving lever.

9. In a paper machine, a multi-nip calender comprising a calender frame including a pair of laterally spaced posts, a stack of calender rolls disposed in front of said posts and including a bottom roll and a plurality of superposed rolls supported thereon, separate and independent bearings rotatably supporting the ends of said calender rol-ls, lift arms having housingsfor said bearings stack, one groove having a lift tbar slidably guided therein having lifting engagement with said arms for raising said calender rolls out of engagement with each other, and the other groove forming a mounting means for said hearing supports for said lift arms and having spacer means I extending thereaiong, locating said bearing supports in j spaced relation with respect to each other.

10. In a paper. machine, a multi-nip calender com- I prising a calender frame including a pair of laterally spaced posts, a stack of calender rolls disposed in 'front of said posts and including a bottom roll and a plurality of superposed rolls supported thereon, separate and in-.

dependent bearings rotatably supporting the ends of said calender rolls, lift arms having housings for said hearings on the outer ends thereof, individual bearing supports for said lift arms, each post being of a channel-like form having an outer web, parallel legs extending therefrom and flanges extending inwardly from the inner ends of said legs and having outer faces facing the inside of the calender stack, each flange having a groove extending therealong opening toward the inside of the calender stack, one'groove having a lift bar slidably guided therein having lifting engagement with said arms for raising said calender rolls out of engagement with each other, and the other groove forming a mounting means for said bearing supports for said lift arms and having spacer means extending therealong, locating said bearing supports in spaced relation with respect to each other, each bearingisupport having a rectangular flange fitting in said groove and being hollow to accommodate a fastening member for securing said bearing support to said groove, and each spacer having clips extending from the ends thereof along the bottom of said groove and fitting under said flange and secured to said groove by said flange.

11. A multi-nip calender comprising a vertical calender frame including a pair of laterally spaced vertically extending posts, a stack of calender rolls disposed in front of said posts and including a bottom roll and a plurality of superposed rolls supported thereon, separate and independent bearings rotatably supporting the ends of said calender rolls, lift arms having housings for said bearings on the outer ends thereof, transversely pivoted to said posts and extending along the inner sides thereof toward the rear ends of said 'posts and having top bearing surfaces at their rear ends, means for successively pivoting said lift arms from the top to the bottom thereof and raising said calender rolls out of engagement with each other and out of engagement with said bottom roll, comprising a separate lift bar guided for movement along the inside of each post, means for simultaneously moving said lift bars along said posts and holding said lift bars in position with respect to said posts, a plurality of parallel spaced pins extending inwardly from said lift 'bars over said bearing surfaces and spaced thereabove, when said calender rolls are in engagement witheach other, and progressively spaced farther apart from the top to the bottom of said bars for engaging said bearing surfaces and pivoting said lift arms to successively raise said calender rolls out of engagement with each other, a separate load relieving lever in association with each lift arm and transversely pivoted to said 'posts adjacent the end portions thereof opposite from said pivots for said lift arms, and having engaging end portions extending over said bearing surfaces, and fluid pressure means mounted on said posts and havin engagement with said loadrelieving levers and pivoting said load relieving levers to engage said bearing surfaces and relieve said calender rolls from a part of the weight of said bearings and bearing housings, and holding said load relieving levers'in various operative positions with respect'to said lift arms, comprising an individual fluid pressure operated diaphragm for each load relieving lever, said groove forming a mounting means for said bearing supports having a T-slot opening thereirito and extending for substantially the length of said posts, said bearing supports being hollow and having rectangular bases fitting in said grooves, said spacers having clips extending therefrom under said flanges, and T-bolts mounted in said T-slot and extending outwardly there-from through the hollow portions of said bearing supports, and securing said bearing supports thereto in spaced relation with respect to each other.

12. In a paper machine, a rnulti-nip calender'comprising a frame including a pair of vertical posts, a stack of calender rolls disposed in front of said posts and including a bottom roll and a plurality of superposed rolls supported thereon, separate and independent bearings rotaty pp ng the ends of said calender rolls, lift arms having housings for said bearings on the outer ends thereof, bearing supports for pivoting said lift arms to said posts for movement about axes parallel to the aXes of said calender rolls, each post being of a channel-like form having an outer Web, parallel legs extending inwardly therefrom and flanges extending inwardly from said legs and having outer faces facing the inside of the calender stack, the forwardmost flange having a T-slot extending therealong opening to the inside of the calender stack and having a groove extending therealong in alignment with said T-slot and forming mounting means for said bearing supports, the rearwardrnost flange having a groove extending therealong having a lift bar slidably guided therein having lift pins extending inwardly therefrom for engagement with said arms for lifting said calender rolls out of engagement with each other, and also having a T-slot extending longitudinally therealong forming a mounting means for mounting brackets extending over said groove and lift bar and slidably retaining said lift bar to said groove, each mounting bracket having a 1% load relieving lever transversely pivoted thereto, extending over an associated lift arm and having a diaphragm mounted thereon operable by the admission of fluid under pressure thereto, to lift said lift arm and relieve the calender rolls from a part of the Weight of the bearings and bearing supports therefor.

References Cited by the Examiner UNITED STATES PATENTS WALTER A. SCHEEL, Primary Examiner, 

1. IN A CALENDER STACK, A PAIR OF PARALLEL SPACED CHANNEL-LIKE POSTS OPENING TOWARD EACH OTHER, A BASE EXTENDING FROM THE BOTTOMS OF SAID POSTS HAVING BEARING SUPPORTS EXTENDING UPWARDLY THEREFROM, A BOTTOM ROLL JOURNALLED IN SAID BEARING SUPPORTS, A SERIES OF SPACED SUPERPOSED CALENDER ROLLS SUPPORTED ON SAID BOTTOM ROLL, THE SUPPORTS FOR SAID CALENDER ROLLS, COMPRISING INDIVIDUAL BEARING HOUSINGS FOR THE ENDS OF SAID ROLLS, LIFT ARMS SUPPORTING SAID BEARING HOUSINGS AND EXTENDING ALONG THE INSIDES OF SAID POSTS AND PIVOTED THERETO INTERMEDIATE THEIR ENDS, PIVOTED LOAD RELIEVING LEVERS PIVOTALLY MOUNTED ON SAID POSTS ENGAGING UPPER SURFACES ON OPPOSITE ENDS OF SAID LIFT ARMS FROM SAID BEARING SUPPORTS, AND FLUID PRESSURE OPERATED MEMBERS HOLDING SAID PIVOTED LOAD RELIEVING LEVERS AND LIFT ARMS IN POSITION AND ROCKING SAID PIVOTED LOAD RELIEVING LEVERS TO ENGGE SAID ARMS AND EXERT LIFTING PRESSURES ON SAID BEARING HOUSINGS AND ROLLS, AND FLUID PRESSURE LINES OPERATIVELY CONNECTED TO SAID FLUID PRESSURE OPERATED MEMBERS AND EXTENDING FROM EACH OF SAID MEMBERS IN READILY ACCESSIBLE POSITION WITHIN THE OPENINGS OF SAID CHANNEL-LIKE POSTS. 